Sandvik Coromant 5857573 Threading Insert 28 Tpi Un

Product Description

The SANDVIK COROMANT 5857573 is a solid carbide laydown threading insert from the CoroThread 266 series, engineered for right-hand external UN thread cutting at 28 threads per inch. It carries a PVD-applied TiCrAlN/TiN coating for wear resistance and heat management during threading operations. The insert features a 3/8-inch inscribed circle, a 60-degree included angle, and a single tooth per side profile with chipbreaker style A. It is used by machinists and CNC operators in production threading applications where consistent thread form and tool life are priorities.

This insert is suited for external UN thread profiles on turning centers and CNC lathes in both job shop and production environments. The CoroThread 266 series insert style and 16 size code indicate use in compatible Sandvik Coromant CoroThread 266 toolholders. The 28 TPI specification targets fine-pitch fastener thread forms common in aerospace, mechanical assembly, and general manufacturing work.

Key Features

• Solid carbide substrate with PVD TiCrAlN/TiN coating for extended tool life in threading operations
• 28 threads per inch, 60-degree included angle for UN external thread profiles
• 3/8-inch inscribed circle and 5/32-inch thickness with chipbreaker style A
• Right-hand cut orientation for standard external threading passes
• Single tooth per side geometry for controlled chip formation
• CoroThread 266 series insert style 266, size code 16, grade 1135

Compatibility

Designed for use in Sandvik Coromant CoroThread 266 series toolholders that accept a 16 insert size code. Manufacturers catalog number 266RG-16UN01A280M 1135 should be used when cross-referencing Sandvik Coromant tooling systems.

Installation Notes

Installation is performed by a machinist or CNC tooling technician. The machine spindle must be fully stopped and the turret or tool station locked out before seating or removing threading inserts. Use the appropriate Torx or clamping key specified for the CoroThread 266 holder to secure the insert without over-torquing the clamp screw. Confirm insert seating and thread pitch against a thread gauge before resuming production cuts.